@OldDIY I owe you discovering this manual service as you prompted me to Kenwood KR 5030 topic which led me to further inquiry in some kenwood designs and now i have the full circle of how the cheaper Kenwood sound became the more expensive Accuphase sound litteraly overnight.
Sounds like reference to class G or H operation.... the reference to volt drop over output devices
Unlike a typical class-H amp, this one runs the high and low voltage outputs in parallel, ie the high voltage output drives the speaker directly rather than boosting the lower rail.